If you allow a dog to play with a ball that is too small he could easily swallow it.
如果你让小狗玩的球太小了，它就可能很容易就把球给吞了。
It applies only if a ball in play interferes with another ball in play.
它适用的是如果一个在比赛中的球妨碍到另一个在比赛中的球。
It applies only if a ball in play interferes with another ball in play.
它适用的是如果一个在比赛中的球妨碍到另一个在比赛中的球。
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